(CNN) -- Authorities have identified a soldier in training as a person of interest in the death of a pregnant soldier in North Carolina, a military official said. Plus, a North Carolina newspaper received a letter purportedly from the soldier's killer.

Authorities discovered the body of Spc. Megan Lynn Touma, 23, who was seven months pregnant, in a motel in Fayetteville, North Carolina, on June 21.

Lt. Col. John Clearwater, a spokesman for the U.S. Army Special Operations Command, told CNN affiliiate WRAL that the person of interest is a training student at the John F. Kennedy Special Warfare Center and School located at Fort Bragg, North Carolina.

Clearwater told The Associated Press the male soldier is training at a school where special operations ranging from raids to reconstruction projects are taught.

Fayetteville police found Touma's body when they responded to a call of strong odor coming from one of the motel rooms.

According to AP reports, police were also investigating a letter, dated June 17, sent to a North Carolina newspaper purported to be written by a person claiming responsibility for Touma's death. Brian Tolley, executive editor of The Fayetteville Observer, told AP the paper turned the letter over to police.

Fayetteville police Lt. David Sportsman told the newspaper that authorities think the letter was written to try to mislead investigators and the media, according to AP reports.

Don't Miss

In the letter, the author confesses to being a serial killer. The writer also put a symbol at the bottom of the letter similar to one used by the Zodiac killer, who was blamed for at least five slayings in California in 1968 and 1969, but never caught.

"I will start using my role-model's signature," the author says in the letter, which was posted on the newspaper's Web site.

It is not yet known if there is any connection between the person of interest and the author of the letter.

Touma, a dental specialist from Cold Springs, Kentucky, arrived at Fort Bragg on June 12.

In five years with the Army, Touma had served with the U.S. Army Dental Activity Clinic in Bamberg, Germany, and in Fort Drum, New York, before her assignment to Fort Bragg.